Please, can you add "export LANG=C" in the top of the rperf script ?
It took me some time to figure out why I was getting arithmetic errors like this one
/tmp/rperf_v14.ksh123: let: rating=81.24/8*3: arithmetic syntax error.
only on some lpars.
It turned out that those machines have LANG="pt_PT" and 81.24 must be written as 81,24
Maybe not exactly a bug, but at least it deserves a note on the page, however I wasn't able to post a comment there.
Thanks for your work, specially on nmon.